UnsupportedOperation:不可写 python

UnsupportedOperation: not writable python

 with open(r'G:\Programs\abc.txt') as f:
    for line in f:
          if line.startswith('logan'):
                 f.write('Johann Sebastian Bach')
                 print("Renewed line = ", line)

错误信息:

    runfile('G:/Python Programs/p17.py', wdir='G:/Python Programs')
Traceback (most recent call last):

  File "<ipython-input-2-393638b0e5ce>", line 1, in <module>
    runfile('G:/Python Programs/p17.py', wdir='G:/Python Programs')

  File "G:\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 880, in runfile
    execfile(filename, namespace)

  File "G:\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 102, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "G:/Python Programs/p17.py", line 11, in <module>
    khand.write('Johann Sebastian Bach')

UnsupportedOperation: not writable

我已经在 python3.6 中列出了这段代码,但我仍然收到一条错误消息。我在目录中有所需的文件。有什么建议么?

在没有模式的情况下打开文件默认以只读模式打开它。如果你想在阅读时写入它,你必须将模式指定为 r+.

with open(r'G:\Programs\abc.txt', mode='r+') as khand:
    ...

w+ 也将以 r/w 模式打开文件, 但是 ,它会将内容擦除干净。

您还可以使用 a+ 模式,该模式将追加到文件末尾,同时仍让您从中读取。